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In this exciting junior graphic novel, the boys create a swimming pool full of gelatin and have loads of fun. Until it's accidentally hit with Dr. Doofenshmirtz's latest device, a ray designed to turn everything evil! Phineas and Ferb must find a way to stop the giant gelatin monster and save Candace. Then, the kids head off to England to visit their grandparents, where Candace uses the detective methods of Sherlock Holmes to bust the boys. Elsewhere, Agent P is forced to partner with Agent Double 00, a snooty spy who has little respect for our hero.